Machine for forming interlocking mitered joints for muntin structures



.v J 1,1954 w. M. KNCJ'UR EK 2,679,869 MACHINE FOR FORMING'INTERLOCKING MITERED JOINTS FOR MUNTIN STRUCTURES Filed July 31, 1952 3 Sheets-Sheet'l Jkz/ez fok w 4 June 1, 1954 w. M KNOUREK MACHINE FOR FORMING INTERLOCKING MITERED JOINTS FOR MUNTIN STRUCTURES Filed July 51, 1952 3 Sheets-Sheet 2 g ['l mum- June 1, 1954 w. M. KNOUREK ,67

MACHINE FOR FORMING INTERLOCKING MITERED JOINTS FOR MUNTIN STRUCTURES Filed July 51, 1952 3 Sheet Sheet 3 parts herein shown window 'muntin bars and Patented June 1, 1954 UNITED STATES MACHINE FOR FORMING INTERLOCKING MITERED JOINTS FOR MUNTIN STRUC- TUBES William M. Knourek, Chicago, Ill. Application July 31, 1952, Serial No. 301,849

6 Claims.

The invention relates generally to window sash a machine muntin structures.

The invention has among its objects the production of a machine which will notch and miter muntin bars whereby a strong interlocking joint is produced, provided with mitered edges to present a neat and attractive appearance, resulting in a stronger window sash construction.

Another object of the invention is the production of such a machine which utilizes only a single control lever, with the notching and mitering operations being successively performed with a single downward movement of the actuating or control lever.

A further object of the invention is the production of such a machine which is readily adjustable to accommodate the various sized muntin bars normally employed simple in construction and operation, having a minimum number of moving parts.

Many other objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from the disclosure herein given.

To this end my invention consists in the novel construction, arrangement and combination of and described, and more particularly pointed out in the claims.

In the drawings wherein like reference characters indicate like or corresponding parts:

Fig. 1 is an elevational view of a portion of a sash structure illustrating the type of by the present invention;

Fig. 2 is a perspective view of the type of joint produced by the present invention;

Fig. 3 is an elevational view of a pair of members such as that illustrated in Fig. 2 prior to their assembly;

Fig. 4 is an elevational view similar to Fig. 3, illustrating the joint produced in heavier muntin bars than those illustrated in Figs. 2 and 3;

Fig. 5 is a front elevational view of a machine embodying the present invention;

Fig. 6 is a sectional view taken approximately .on the line 6-45 of Fig. 5;

Fig. '7 is a sectional view taken approximately on the line ?-7 of Fig. 6; and

Fig. 8 is a sectional view taken approximately on the line 3-8 of Fig. 5.

Heretofore, in constructing divided-light windows and the like, the sash rails and stiles have been constructed in the usual manner and the 1 and which is relatively joints adapted to be produced M muntins or bars dividing the sash into a plurality of panels, each of which is to be provided with a separate pane of glass, have been constructed as a series of separate pieces. For example, assuming the sash is to be divided into four panes, thus requiring a horizontal and a vertical division of the sash, one of the dividing bars may be made from a single piece of material and the other formed as two pieces. Thus, the vertical bar may be made of a single piece of material and secured at its top and bottom ends to the respective top and bottom rails or the sash, in which case, the horizontal division would then consist of a pair of bars each of a size to extend from the vertical dividing bar to the adjacent stile. In like manner the horizontal bar may be a single member and the vertical division in two pieces. The stiles, rails and bars are normally provided with an ornamental molding usually embodying both straight and curved surfaces, and in joining the bars to the sash as well as the ends of the horizontal bars to the vertical bar, a mortise and tenon type of joint has been employed, such joint normally utilizing a tenon on the ends of the respective bars which is inserted in a mortise in the sash and in the vertical bar. The ends of each bar adjacent the tenon, however, must be cut or coped to provide an end surface complementary to the curved surface of the ornamental molding to achieve a neat joint. It will be apparent, however, that it is difficult to cut the ends of the bars sufiiciently accurate to provide a uniform joint between the ornamental portions of the bars and sashes, particularly where such ornamental portions utilize reverse curves and the like.

By the use of the present invention a joint may be produced which is so designed that all of the dividing bars in the sash may be constructed full length and thus extend from one rail of the sash to the other or from one stile to the other, the bars being constructed at their intersections to form a relatively strong half-lap joint, with the ornamental portions or" the bars at such intersection being provided with mitered surfaces to provide a neat joint which does not require any cutting or coping of irregular or curved surfaces.

Referring to the drawings, particularly Fig. 1, i indicates generally a portion of a window sash,

the upper rail 2 of which is suitably joined to the of the bars 4 and may be secured to the respective rails and stiles by any suitable means, as for example, that commonly employed utilizing a tenon I, illustrated in Fig. 2, mortised into the respective sash members.

The joint at the intersection of the bars 4 and 5 is illustrated in Figs. 2 and 3 and it will be noted that each of the members 4 and 5, which are formed from the same stock, are generally T-shaped in cross section, comprising a shank section 8 and head section 9, the latter being greater in width than the head section to provide outwardly extending portions H, with the shoulders 12 thus formed providing abutments for the peripheral portions of the window panes, following insertion of which putty is run along the pane edges and the faces l3 of the shank portion 8. The outwardly extending portions l l of the head section 9 are ornamental- 1y shaped to present an attractive appearance,

, and in the embodiment of the invention illustrated include reversely curved surfaces l4. Corresponding portions of the rail 2 and stile 3 are likewise shaped as indicated at 15, thereby forming a uniform molding around the edges of each pane of glass.

The member 5, as illustrated in Figs. 2 and 3, is cut away at the shank portion 8 to form a slot or notch l6 which is complementary in shape to the shank portion 8 of the member 4, the width of the slot 5 merely being suflicient to permit a snug fit with the shank section of the member 4. Outwardly extending portions H of the head section 9 of the member 5 are cut away as indicated at IT to form a portion [8 which conmeets the material of the bar on opposite sides 'of the slot IS, the portion l8 having parallel side surfaces as clearly illustrated in Figs. 2 and 3. The head section 9 of the bar 4 is provided with a slot l9 which is complementary in shape to the connecting portion I8 of the bar 5, the slot l9 likewise being of a width to snugly receive the portion I8. Thus, the slot I6 is complemental to the shank portion 8 of the bar 4, and

the slot I9 is complemental to the connecting portion l8 of the bar 5, whereby a half-lap joint is formed when the members 4 and 5 are interlocked in intersecting relation.

To provide a neat joint between the outwardly extending portions H of the head sections 9 and particularly the curved surfaces 14 thereof, the opposing end edges of the head sections H adjacent the connecting portion l8 of the member 5 and slot IQ of the member 4 are cut at diverging angles as indicated at 2|, the angle in the embodiment illustrated being forty-five degrees with respect to the longitudinal axes of the respective members, as the members 4 and 5 intersect at right angles in such embodiment of the invention. Thus when the members 4 and 5 are interlocked as illustrated in Fig. l, the edges 2! form a mitered joint between the ornamental portions of the respective members, whereby the curved surfaces of the head sections will all meet at the same points to provide a neat and uniform joint.

It will be noted that with this construction the members 4 and 5 are securely interlocked by a relatively strong half-lap joint, while the ornamental portions of the members are provided with mitered joints. It might be mentioned that in the embodiment of the invention illustrated, as the shank section 8 of each member is shorter in length than the corresponding dimension of H the head section, the slot l6 extends approximately half way through the total width of the respective members, so that, in effect, the shank section of the member 4 is extended as indicated at 22 into the head section. This construction is utilized to provide approximately equal strength between the members 4 and 5 at the joint, and of course can be varied if desired, depending upon the particular shape of the bar employed, etc. Likewise, the invention could be utilized for intersecting members extending at an angle with respect to one another other than ninety degrees, in which case the slots l6 and 29 would be suitably proportioned to efiect the desired angles. Likewise in such case the end edges Zl of the outwardly extending portions ll of the head sections 9 would be cut at such angles as to provide equal angles between abutting edges and the axes of their respective members and thereby provide uniform mitered joints between each pair of intersecting edges.

Where muntin bars of larger size than those illustrated in Figs. 2 and 3 are employed, the same size notches and mitered edges may be utilized by extending the mitering into the intermediate portion of the bars. Such a construction is illustrated in Fig. 4, and it will be noted that the mitered edges 2| of the bars 4' and 5' extend into the portion 18' of the bar 5, o that the notches l6 and I9 are of the same width as the notches l6 and I9, even though a larger size bar is employed.

The machine for cutting the joints in the bars 4 and 5, illustrated in Figs. 5 through 8, contemplates the use of a rotary cutter to cut the notches l6 and I9 and a shearing head to cut the mitered edges, these operations being performed successively by the actuation of a single control member.

Referring to Figs. 5 and 8, the reference numeral 3| indicates generally a suitably formed base, which in the embodiment of the invention illustrated is constructed as a casting, comprising a base portion 32 and a vertically extending portion 33, the latter bein channel-shaped in cross section.

Mounted on the top of the upright portion 33 of the base, is a member 34 which is open in front and back comprising a pair of spaced side walls 35 connected at their upper and lower ends by an upper cross member 35 and a lower cross member 31. The member 34 may also be formed as a single piece casting and is secured to the base 33 by suitable bolts 38. Extending between the top member 36 and bottom member 31 is a pair of spaced cylindrical guide members or rods 39 which are secured in fixed relationship with respect to the member 34 by set screws 4! or other suitable means.

Slidably mounted on the guide rods 39 is a lower carriage indicated generally by the numeral 42 and an upper carriage indicated generally by the numeral 43. The carriages 42 and 43 are generally similar in shape, having respective vertically extending body portions 44 and 45, and each having a pair of rearwardly extending flanges 46 which are provided with bores 4'! through which the guide rods 39 extend. Thus the carriages 42 and 33 may move vertically along the guide rods 39 but are otherwise maintained in fixed relation with respect to the member 34. Interposed between the upper flange 46 of the lower carriage 42 and the lower flange 46 of the upper carriage 43 is a pair of compression springs 48, each of which encircles a respective guide .through the vertical portion rorl-39, operative to urge the lower carriage downwardly and the upper carriage upwardly.

Rigidly mounted on the member 34 intermediate the upper and lower carriages is a work supporting structure or table indicated generally by the numeral 49 comprising an L-shaped bed member 5!, the vertically extending portion 52a of which is secured to the side walls 35 of the member 5% by bolts 53. Secured to and extending laterally outward from the member 5| is a pair of bed plates 54 which are provided with means for holding the work as will hereinafter be described.

Carried by the lower carriage 42 is a rotary cutter 55 which is mounted for both vertical and axial adjustment with respect to the carriage, the structure for accomplishing these results comprising a rectangular plate or member 55 which is laterally slidable with respect to the body portion 44 of the carriage, the latter and the member 56 being keyed together by a horizontally extending key 51' positioned in horizontally extending keyways in the respective members. The member 55 is locked to the carriage 42 by bolts 58 extending through horizontally ex tending counterbored slots 59 in the member 56 and threaded into the portion 44 of the carriage. Slidably mounted on the member 55 for vertical movement is a journal block indicated generally by the numeral 6|, which is connected to the member 55 by a vertically extending key 62 positioned in cooperating vertically extending keyways in the respective members, with the block 6| being locked in any relative position of vertical adjustment by a headed bolt 63 extending through a vertical slot es in the block 6| and threaded into the member 55. Rotatably supported in suitable bearings in the journal block 6! is a spindle 55 which carries the cutter 55 adjacent one end thereof and a driving pulley 66 adjacent the other end thereof. As illustrated in Figs. 5 and 6, the carriage 42 is formed with a vertically extending channel 67 which extends of the carriage and into the flanges 46 to provide clearance for the cutter 55. It will be apparent from the above description that the cutter may be laterally adjusted with respect to the carriage by shifting the member 56 relative to the portion 44, and vertically adjusted by shifting the journal block 6! relative to the member 55. The'bed member 5| is likewise provided with a slot 68 which is located in both the horizontal and vertical extending portions of the bed member, whereby the carriage 52 may be raised to bring the upper edges of the cutter 55 above the horizontal portion 52b of the bed member 5i.

The carriage 42 is moved upwardly by means of a foot-operated lever or treadle 69 which is pivoted at its rear end to the base 5! as indicated at H, and is provided with a foot engageable portion 12. The treadle 69 is normally maintained in a raised position by coiled tension spring 73 secured at its lower end to the treadle 69 as indicated at Hi and at its upper end to the upright portion 33 of the base 3! as indicated at 15. Secured to the bottom portion 3'! of the member 34 and extending downwardly therefrom is an L-shaped member 76, the horizontal portion 1! of which is secured to the bottom portion 37 by bolts '55 threaded into the bottom 37. Pivotally mounted on the vertically extending portion IQ of the member is a cam 8 l, the latter being pivotally supported on a bolt or bearing pin 82 carried by the member 16. The cam BI is connected to the control lever or treadle 69 by the bar 83 which is pivotally connected to the lever 69 as indicated at 84 and at its upper end is pivotally connected to the cam 8| as indicated at 85. Thus as the lever 65 is pivoted downwardly the cam 81 will be rotated in a clockwise direction as viewed in Fig. 5, bringing the cam surface 86 of the cam into engagement with a roller 81 carried by an arm 88 pivotally connected at its upper end to the portion 44 of the carriage 42. As clearly illustrated in Fig. 5, the arm 88 is baised in a counterclockwise direction by a spring 89, clockwise movement of the arm being limited by a stop 91 :extending outwardly from the front face of the body portion 44. Consequently, as the cam surface of the cam 8-I engages the roller 81, the arm 88 will remain in the position illustrated in Fig. 5, whereby the carriage 42 is moved upwardly thereby until the high portion of the cam passes by the roller, following which the springs 48 will return the carriage 42 to its initial position illustrated in Fig. 5. Upon release of the treadle 69 the spring 73 will return the cam 8| to its original position, with the arm 83 pivoting in a clockwise direction against the action of the spring 89 to permit the high portion of the cam to pass by the roller 81.

Carried by the upper carriage 43 is a mitering head indicated generally by the numeral 92, having a pair of knife blades 93 mounted thereon, each of the blades being generally L-shaped in transverse cross section as indicated in Fig. 7 and having diagonally extending cutting edges 95 at the lower ends of the respective leg portions, the knife blades being secured to the head 92 by screws 95, whereby the cutting edges 94 on each blade lie in the planes of the outer surfaces of the leg portions which in the embodiment illustrated extend at right angles with respect to each other. As illustrated in Fig. 7, the cutting edges 94 on each blade do not intersect but are connected by respective portions 55, extending diagonally at an angle of 45 degrees with respect to the leg portions associated therewith, the lower ends of the portions 96 being likewise provided with cutting edges at the outer faces thereof, with the respective cutting edges of the diagonally extending portions 96 being parallel to one another. Likewise, in the embodiment of the invention illustrated, each pair of diametrically opposite cutting edges 54 are positioned in a common plane. The head 92 is supported by the carriage 43 by an L-shaped block 9'! having a vertically extending portion 98 and horizontally extending portion the por-, tion 99 having a bore therein of a size to receive a stem or shank hill on the head 92.

As illustrated in Fig. 6, the vertically extending portion 98 of the block 9? is positioned in a vertically extending channel 52 in the body portion 45 of the carriage 33, thus restricting movement of the block 91 to a vertical direction. The block 9! is locked tothe carriage 43 by plate 53 extending across the vertical portion 9:3 and secured to the portion 45 of the carriage by bolts I94. Thus by loosening the bolts M5, the block 9'! and head 92 may be vertically adjusted with respect to the carriage. Positioned between the two knives 93 adjacent the cutting edges 94 thereof is a presser bar I55 which is carried by a pair of vertically extending rods )6 to which the bar I05 is rigidly secured, the upper ends of the rods I 86 extending through and slidable in a guide bar lfil which is provided with a bore through which the .upper end of the shank Hll-of;the

cutter head extends, the bar It? being locked at its lower end to the treadle 69 by the same -means that connects the link 3'3 to the treadle.

The link arm H2 extends upwardly from its connection with the treadle, then diagonally rearward and then upwardly through an opening I E3 in the top of the upright portion 33 of the base 3I to adjacent the carriage 43. The upper end of the link arm I2 is operatively connected to the carriage 43 by a rearwardly extending member II I which is rigidly connected to the carriage 43 with the rear end of the member Ilfl having a laterally extending pin H5 which extends into an elongated slot IIG in the upper end of the link arm II2. Thus when the treadle 69 is initially depressed the carriage d2 will be elevated as heretofore described, with the carriage 43 remaining stationary as a result of the lost motion provided by the slot H8. Following return of the carriage 42 to its original position, the upper end of the slot I55 will engage the pin II5 and further depression of the treadle 59 will result in the link arm H2 drawing the carriage 43 downward. Extending downwardly from the lower flange 48 of the carriage 53 is a stop rod I I1 which will engage the upper flange 46 of the lower carriage at the downward limit of movement of the carriage 43. The stop rod IiI also prevents any possible engagement between the cutter 55 and the cutting knives 93 in the event that the lower carriage, for any reason, failed to return to its initial position.

The cutter 55 is operatively connected to a suitable source of power such as a motor H8 by a belt H9 operatively connected to a driving pulley on the motor and the pulley on the spindle 65. motor base I2! is pivotally connected at 22 to a pair of angle members I23 carried by and extending rearwardly from the upright portion 33 of the base 3i, so that the weight of the motor provides means for tensioning the belt H9.

Secured to the bed plate 54 is a backing plate I24 which is provided with a notch 225 to provide clearance for the cutter when the latter is in an elevated position, the backing plate I24 being supported from the bed plate 54 by a pair 1 of rods I25 suitably secured to the backing plate I25 and extending horizontally outward into respective blocks I'2'I positioned below the respective bed plates adjacent the outer ends of the latter. The rods I25 and thus the backing plate I24 are locked in position by a pair of thumb screws I23 threaded into the respective blocks I21.

Removably mounted on the bed plates 54 is a pair of jig blocks I29, the latter being secured to the bed plates 54 by bolts I3I and wing nuts I32. The jig blocks I29 are constructed of wood or other suitable material and, as illustrated in Fig. 6, are each provided with a longitudinally extending groove I333. The pair of jig plates illustrated in the drawings as clearly shown in Fig. 6

is provided with a channel which is complementary to the exterior surface of the head section 9 of the muntin bars, whereby the latter may be firmly held in the jig blocks in an inverted position. A second pair of jig blocks would also In the construction illustrated the be employed which would be provided with a channel or groove similar to the groove I33, but complementary to the shank section 3 of the muntin bar whereby the latter could be securely held in an upright position with the head sec tion 9 up. Extending laterally outward from the bed member 49 is a pair of rods I34 on which are mounted respective stops I35 for the muntin bars. Each of the stops I35 is provided with a pair of downwardly extending leg portions I35 between which is positioned a sleeve I31, locked to its respective rod I34 by a set screw I38. Thus the sleeves I31 prevent movement of the stops along the rods I34. but permit the stops to be freely rotated about their respective rods I34, so that when desired stops may be rotated downwardly out of the way.

As illustrated in Fig. 6, a guard strip I38 may be positioned in front of the cutter 55, the upper end of the guard strip I33 being secured to the front edge of the bed member it by bolts I39 and the bottom end of the member being secured to the member "I5 by bolts MI. Carried by the guard strip I38 at each side or" the cutter 55 is a shield plate I42 operative to eliminate any possibility of contact by the operator with the cutter 55.

Normally in the operation of the machine a series of muntin bars will be similarly notched and mitered, as for example, a series of bars 4 having the notch is formed in the head section, the machine being set up for such operation as illustrated in the drawings.

Following notching of a suflicient number of bars, the second set of jig blocks I29 would be mounted on the bed plates E l and a sufficient number of bars 5 with the notches It would be run through the machine. When the machine is in use, one of the stops E35 being set to accurately define the point at which the cutting operations are to be performed, when the muntin bar is placed in the jig blocks I29 with one end abutting the stop, and following such positioning, treadle 69 is depressed, initial movement of the treadle raises the carriage 32 to bring the cutter 55 into engagement with the muntin bar and cut the notch IE or I9, as the case may be,

therein. Following the notching of the bar, the carriage 42 will drop to its initial position under the action of the springs 38 as the cam SI disengages the roller 81. Continued downward movement of the treadle 63 will move the carriage 43 downwardly to bring the presser bar into engagement with the muntin bar, continued downward movement of the carriage bringing the cutting edges 94 of the knives 93 into engagement with the muntin bar to shear the miter notches in the bar, the presser bar Silas urged downwardly by the springs 99, firmly maintains the muntin bar in a stationary position during such operation. As illustrated in Fig. 7, the ends of the jig blocks I29 adjacent the cutting head 92 are complementary to the knife blades 93 to insure efficient shearing action without splintering the muntin bar. Upon release of the treadle the carriage 43 is returned to its initial position by the springs d8. Following completion of the cutting operation, when desired, the muntin bar may be moved longitudinally in the jig blocks 329 and the operation repeated at a second desired point along the muntin bar.

As previously mentioned, while the cutter 55 and cutting head 92 may be replaced with larger cutters and heads to accommodate cliiierent sized bars, a single sized cutter and head may be satista'ctorilyemployedover a fairly-wide 'ra-ngebf muntin'bars, such-use having been previously l illustrated in Fig.- 4.

It will be apparent from the-above disclosure that I-have provided a relatively simple'machine "for simultaneously notching and miteri-ng muntin bars and'the like in a-single'operation-of a control or actuating member, enabling'the rapid'pro- .spiritof my invention; hence, I do not wish [to be understood aslimiting myself to the exact form, construction, arrangement and combination of parts herein shown'and described, or uses mentioned.

- What I claim as. new and desire to secure by Letters Patent is:

' 1. In a machine'of the kind. described, the combination of a supporting base structure, a pair of vertically aligned carriages, means on said base structure for guiding said carriages for independent vertical reciprocation, a horizontally extending worksupporting table on said base structure vertically positioned between said carriages, means for urging the upper carriage upwardly andthe lower carriage downwardly, a.horizontallyslidable member carried by said lower. carriage for lateral adjustment relative to such carriage, a vertically movable journal block adjustably mounted on saidslidable member for vertical adjustment, a horizontally extending spindle rotatably carried by and vertically movable with said journal block, a rotary cutter rigidly mounted on said spindle, power means for rotating said spindle and cutter during vertical movement of the latter, a shearing head having a plurality of cutting edges carried by said upper carriage, a movable actuating lever, cam means operatively related to said lever andv lower carriage whereby a predetermined movement of said lever will cause reciprocation of said lower carriage, and means operatively related to said lever and the upper carriage whereby further movement ofv said lever will cause the upper carriage tomove downwardly toward the table, and means biasing said lever in a non-actuating position.

2. In a machine of the kind described,.the combination of a supporting basestructure, a pair of laterally spaced vertically extending guide rods carried by said: base structureflfor independent vertical reciprocation, ahorizontally extending work supporting table on said base structure vertically positioned between said carriages, work supporting jig blocks positioned on said table, means for urging the upper carriage upwardly. and the lower carriage downwardly, means for limiting the travel of said carriages toward one another, a horizontally slidable member carried by said lower carriage for lateral adjustment relative to such carriage, a vertically movable 'journalblock adjustably mounted on said slidable member for vertical adjustment, means for maintaining the slidable member and journal block in any adjusted position with respect to each other and the lower carriage, a horizontally extending spindle rotatably carried by and movable with said journal block, a rotary cutter rigidly mounted on said spindle, power means for rotating said spindle and cutter during vertical movement of the latter, a shearing head, comprising a body member having means for attachment-to'the' upper carriage, a pair of knife blades, each L-shaped in transverse cross- -'section=with the angularly extending'leg portions extending at 'right' angles and connected by an intermediate portion extending atan angle of 45 degrees with respect to each leg portion, the

lower end of each blade being formed to pro- "vide cutting end edges, said knife blades being mounted on said body member with'the mitering edges 'of the diagonal portions in oppose-:1 paral- "lel-relation', and each pair of diametrically opposite cutting edges ofthe knife blades disposed "in a common plane, a vertically movable work engage'able pressure bar positioned between the diagonal portions of said blades, spring means associated with: said bar operative to urge the latterin a downward direction toward said table, amovable actuating lever, cam means operatively related'to said lever and lower carriage whereby a predetermined movement of said lever willcause reciprocation of said lower carriage, and means operatively related to said lever and the upper carriage whereby further movement of said lever will cause the upper'carriage to move downwardly toward'the table,'and means biasing said lever in a non-actuating position.

3. In a"machine 'of the kind described, the combination of a supporting base structure, a pair of laterally spaced vertically extending guide rods carried bysaid base structure, a pair of vertically aligned carriages slidably mounted on said guide rods for independent vertical reciprocation, a horizontally extending work supporting .table on said base structure vertically positioned between said carriages, work supporting jig blocks positioned on said table, means for urging the upper carriage upwardly and'the lower carriage downwardly, means for limiting the travel of said carriages toward one another, a horizontally slidable member carried by said lower carriage for lateral adjustment relative to such carriage, a

vertically movable journal block adjustably mounted on said. slidable member for vertical ad- :justment, means ..for maintaining the slidable member and journal block inany adjustedpositionwith respect to-.each other and the lower carriage, a horizontally extending spindle rota-tablycarried by and movable with said journal block, a .rotary cutter rigidly mounted on said spindle, power means for rotating said spindle and cutter during vertical movement of the latter, a-rotatablecamoperatively carried by said base structure below said lower carriage, a springbiased-camengageable arm pivotally mounted on saidlower carriage. and extending. downwardly therefrom, said arm having camengaging means at its lower end, a movable actuating-lever pivotally connected adjacent one end to said base structureand positioned below said cam, a link memberoperatively connecting said lever :and cam for rotating the latter when the lever is depressed-spring means for biasing said lever in a.-raised-position, saidcam having a high portion engageable with said cam engageable arm to raise .the lower carriage when the actuating lever is partially depressed, and a pair of low portions at either side of said high portion to permit the return of said carriage to its initial position upon further depression of the actuating lever, or the return thereof to its raised position, a second link member operatively connecting said actuating lever and said upper carriage, said lastmentioned link member having a lost motion connection at one end thereof whereby depression of said lever is operative to move the upper carll riage downwarmy following reciprocation of said lower carriage.

In a machine of the kind described, the combination of a supporting base structure, a pair of vertically aligned carriages, means on said base structure for guiding said carriages for independent vertical reciprocation, a horizontally extending work supporting table on said base structure vertically positioned between said carriages, means for urging the upper carriage upwardly and the lower carriage downwardly, a horizontally slidable member carried by said lower carriage for lateral adjustment relative to such carriage, a vertically movable journal block adjustably mounted on said slidable member for vertical adjustment, a horizontally extending spindle rotatably carried by and vertically movable with said journal block, a rotary cutter rigidly mounted on said spindle, power means for rotating said spindle and cutter during vertical movement of the latter, a shearing head having a plurality of cutting edges carried by said upper carriage, a rotatable cam operatively carried by said base structure below said lower carriage, a spring-biased cam engageable arm pivotally mounted on said lower carriage and extending downwardly therefrom, said arm having cam engaging means at its lower end, a movable actuating lever pivotally connected adjacent one end to said base structure and positioned below said cam, a link member operatively connecting said lever and cam for rotating the latter when the lever is depressed, spring means for biasing said lever in a raised position, said cam having a high portion engageable with said cam engageable arm to raise the lower carriage when the actuating lever is partially depressed, and a pair of low portions at either side of said high portion to permit the return of said carriage to its initial position upon further depression of the actuating lever, or the return thereof to its raised position, a second link member operatively connecting said actuating lever and said upper carriage, said last-mentioned link member having a lost motion connection at one end thereof whereby depression of said lever is operative to move the upper carriage downwardly following reciprocation of said lower carriage.

5. In a machine of the kind described, the combination of a supporting base structure, a pair of vertically aligned carriages, means on said base structure for guiding said carriages for independent vertical reciprocation, a horizontally extending work supporting table on said base structure vertically positioned between said carriages, means for urging the upper carriage upwardly and the lower carriage downwardly, a horizontally slidable member carried by said lower carriage for lateral adjustment relativ to such carriage, a vertically movable journal block adjustably mounted on said slidable member for vertical adjustment, a horizontally extending spindle rotatably carried by and vertically movable with said journal block, a rotary cutter rigidly mounted on said spindle, power means for rotating said spindle and cutter during vertical movement of th latter, a shearing head comprising a body member having means for attachment to the upper carriage, a pair of knife blades, each L-shaped in transverse cross-section with the angularly extending leg portions extending at right angles and connected by an intermediate portion extending at an angle of 45 degrees with respect to each leg portion, the lower end of each blade being formed to provide cuttin end edges, said knife blades being mounted on said body member with the mitering edges of the diagonal portions in opposed parallel relation, and each pair of diametrically opposite cutting edges of the knife blades disposed in a common plane, a vertically movable work engageable pressure bar positioned between the diagonal portions of said blades, spring means associated with said bar operative to urge the latter in a downward direction toward said table, a movable actuating lever, cam means operatively related to said lever and lower carriage whereby a predetermined movement of said lever will cause reciprocation of said lower carriage, and means operatively related to said lever and the upper carriage whereby further movement of said lever will cause the upper carriage to move downwardly toward the table, and means biasing said lever in a non-actuating position.

6. In a machine of the kind described, the combination of a supporting base structure, a pair of vertically aligned carriages, means on said base structure for guiding said carriages for independent vertical reciprocation, a horizontally extending work supporting table on said base structure vertically positioned between said carriages, means for urging the upper carriage upwardly and the lower carriage downwardly, a horizontally extending spindle rotatably carried by and vertically movable with said lower carriage, a rotary cutter rigidly mounted on said spindle, power means for rotating said spindle and cutter during vertical movement of the latter, a shearing head having a plurality of cutting edges carried by said upper carriage, a movable actuating lever, means operatively related to said lever and lower carriage whereby a predetermined movement of said lever will cause reciprocation of said lower carriage, and means operatively related to said lever and the upper carriage whereby further movement of said lever will cause the upper carriage to move downwardly toward the table, and means biasing said lever in a non-actuating position.

References Cited in the file of this patent UNITED STATES PATENTS 

